body {
  font-family: Arial, sans-serif;
  margin: 20px;
}

h1 {
  color: #333;
}

nav ul {
  list-style-type: none;
  padding: 0;
}

nav ul li {
  display: inline;
  margin-right: 10px;
}

form {
  margin-top: 20px;
}

input, button {
  margin: 5px 0;
  padding: 10px;
  width: 100%;
  max-width: 300px;
}

button {
  background-color: #28a745;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color: #218838;
}

#userList {
  list-style-type: none;
  padding: 0;
}

#userList li {
  background: #f9f9f9;
  margin: 10px 0;
  padding: 10px;
  border: 1px solid #ddd;
}